Hard for me to understand your question. High School physics. Speed = distance/time. If you want MPH, measure distance in feet, time in seconds then use 60 mph = 88 ft/second. In simple terms, divide speed by 88 then multiply by 60.
Has nothing to do with rear tire size unless you have a tractor like my jubilee and you change tire size.
The tach on my Old Jubilee, shows speed in each gear for any engine RPM.
Too early for me to understand the rest of your question.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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